Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
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Amount, excluding accrued interest, of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Amount at par value of financing receivable purchased with credit deterioration.

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-Topic 326
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Amount at purchase price of financing receivable purchased with credit deterioration.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-19

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Amount of discount (premium) attributable to other factors on financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-19

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Business Combinations - PCD Loans Acquired (Details) - USD ($) $ in Millions			12 Months Ended
	Mar. 20, 2023	Dec. 01, 2022	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
ACL at acquisition			$ (13)	$ (51)
Signature Bridge Bank
Business Acquisition [Line Items]
Par value (UPB)	$ 583
ACL at acquisition	(13)
Non-credit (discount)	(76)
Fair value	$ 494
Flagstar Bancorp
Business Acquisition [Line Items]
Par value (UPB)		$ 1,950
ACL at acquisition		(51)
Non-credit (discount)		(33)
Fair value		$ 1,866